/*
// <copyright>
// dotNetRDF is free and open source software licensed under the MIT License
// -------------------------------------------------------------------------
// 
// Copyright (c) 2009-2017 dotNetRDF Project (http://dotnetrdf.org/)
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is furnished
// to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
// </copyright>
*/

using System;

namespace VDS.RDF.Configuration
{
    /// <summary>
    /// Key for Objects that are cached by the Configuration Loader
    /// </summary>
    class CachedObjectKey : IEquatable<CachedObjectKey>
    {
        private INode _n;
        private IGraph _g;

        /// <summary>
        /// Creates a new Cached Object Key
        /// </summary>
        /// <param name="objNode">Object Node</param>
        /// <param name="g">Configuration Graph</param>
        public CachedObjectKey(INode objNode, IGraph g)
        {
            _n = objNode;
            _g = g;
        }

        /// <summary>
        /// Gets the Hash Code for the Key
        /// </summary>
        /// <returns></returns>
        public override int GetHashCode()
        {
            return Tools.CombineHashCodes(_g, _n);
        }

        /// <summary>
        /// Gets whether this Key is equal to the given Object
        /// </summary>
        /// <param name="obj">Object</param>
        /// <returns></returns>
        public override bool Equals(object obj)
        {
            if (obj is CachedObjectKey)
            {
                return Equals((CachedObjectKey)obj);
            }
            else
            {
                return false;
            }
        }

        /// <summary>
        /// Gets whether this Key is equal to the given Key
        /// </summary>
        /// <param name="other">Key</param>
        /// <returns></returns>
        public bool Equals(CachedObjectKey other)
        {
            return ReferenceEquals(_g, other._g) && _n.Equals(other._n);
        }
    }
}
